What is with the CFA notation?

I go through Schweser and I understand the formulas perfectly. I try to reconcile with the book and I feel like I’m in pre-school. Look at how they try to explain FRA’s on page 36 in vol. 6, I almost feel like its intentionally daunting. Also, anyone notice how many times Schweser mentions the numerator-denominator rule, I feel like they are mothering me. Quite the contrast.